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Gathering detailed insights and metrics for duplicate-package-checker-webpack-plugin

Gathering detailed insights and metrics for duplicate-package-checker-webpack-plugin

duplicate-package-checker-webpack-plugin - 3.0.0 | npmpackage.info

duplicate-package-checker-webpack-plugin

🕵️ Webpack plugin that warns you when a build contains multiple versions of the same package

3.0.0

708

MIT

JavaScript

Installations

npm install duplicate-package-checker-webpack-plugin

Developer Guide

BETA

Typescript

No

Module System

CommonJS

Node Version

9.5.0

NPM Version

5.6.0

Pull Requests

Open

26

Total

39

Closed

8

Merged

5

Issues

Open

12

Total

24

Closed

12

Releases

Unable to fetch releases

Languages

1

JavaScript

JavaScript (100%)

Developer

darrenscerri

Download Statistics

Total Downloads

0

Last Day

0

Last Week

0

Last Month

0

Last Year

0

GitHub Statistics

MIT License

708 Stars

41 Commits

31 Forks

5 Watchers

26 Branches

5 Contributors

Updated on Jan 13, 2025

Maintainers

1

View All 5 Contributors

Package Meta Information

Latest Version

3.0.0

Package Id

duplicate-package-checker-webpack-plugin@3.0.0

Size

48.04 kB

NPM Version

5.6.0

Node Version

9.5.0

Published on

Mar 20, 2018

Total Downloads

Cumulative downloads

Total Downloads

NaN

Last Day

0%

NaN

Compared to previous day

Last Week

0%

NaN

Compared to previous week

Last Month

0%

NaN

Compared to previous month

Last Year

0%

NaN

Compared to previous year

Weekly Downloads

Monthly Downloads

Yearly Downloads

Dependencies

4

chalk find-root lodash semver

Dev Dependencies

9

babel-cli babel-core babel-polyfill babel-preset-es2015 husky jest lint-staged prettier webpack

???? duplicate-package-checker-webpack-plugin

Webpack plugin that warns when your bundle contains multiple versions of the same package.

duplicate-package-checker-webpack-plugin

Why?

It might be possible that a single package gets included multiple times in a Webpack bundle due to different package versions. This situation may happen without any warning, resulting in extra bloat in your bundle and may lead to hard-to-find bugs.

This plugin will warn you of such cases to minimize bundle size and avoid bugs caused by unintended duplicate packages.

Motivation: https://github.com/webpack/webpack/issues/385 and https://github.com/webpack/webpack/issues/646.

Install

1npm install duplicate-package-checker-webpack-plugin --save-dev

Configuration

Add the plugin to your webpack config:

1var DuplicatePackageCheckerPlugin = require("duplicate-package-checker-webpack-plugin");
2
3module.exports = {
4  plugins: [new DuplicatePackageCheckerPlugin()]
5};

You can also pass an object with configurable options:

1new DuplicatePackageCheckerPlugin({
2  // Also show module that is requiring each duplicate package (default: false)
3  verbose: true,
4  // Emit errors instead of warnings (default: false)
5  emitError: true,
6  // Show help message if duplicate packages are found (default: true)
7  showHelp: false,
8  // Warn also if major versions differ (default: true)
9  strict: false,
10  /**
11   * Exclude instances of packages from the results.
12   * If all instances of a package are excluded, or all instances except one,
13   * then the package is no longer considered duplicated and won't be emitted as a warning/error.
14   * @param {Object} instance
15   * @param {string} instance.name The name of the package
16   * @param {string} instance.version The version of the package
17   * @param {string} instance.path Absolute path to the package
18   * @param {?string} instance.issuer Absolute path to the module that requested the package
19   * @returns {boolean} true to exclude the instance, false otherwise
20   */
21  exclude(instance) {
22    return instance.name === "fbjs";
23  }
24});

Strict mode

Strict mode warns when multiple packages with different major versions (such as v1.0.0 vs v2.0.0) exist in the bundle.

Packages with different major versions introduce backward incompatible changes and require either interventions on third-party packages or unsafe workarounds (such as resolving differing package major versions dependencies with a single version).

It is suggested that strict mode is kept enabled since this improves visibility into your bundle and can help in solving and identifying potential issues.

Resolving duplicate packages in your bundle

There are multiple ways you can go about resolving duplicate packages in your bundle, the right solution mostly depends on what tools you're using and on each particular case.

Webpack `resolve.alias`

Add an entry in resolve.alias which will configure Webpack to route any package references to a single specified path.

For example, if Lodash is duplicated in your bundle, the following configuration would render all Lodash imports to always refer to the Lodash instance found at ./node_modules/lodash.

alias: {
  lodash: path.resolve(__dirname, 'node_modules/lodash'),
}

Note: Aliasing packages with different major versions may break your app. Use only if you're sure that all required versions are compatible, at least in the context of your app

Yarn `install --flat`

Yarn allows flat installations (yarn install --flat) which will only allow one version of each package to be installed.

Yarn resolutions

If you want more control over your overridden dependency versions and don't feel like using yarn install --flat, yarn supports "selective version resolution" which allows you to enforce specific versions for each dependency.

package.json

{
  "dependencies": {
    "lodash": "4.17.0",
    "old-package-with-old-lodash": "*"
  },
  "resolutions": {
    "old-package-with-old-lodash/lodash": "4.17.0"
  }
}

NPM Dedupe

If you use NPM and not Yarn, you can try running npm dedupe. NPM may leave multiple versions of the same package installed even if a single version satisfies each semver of all of its dependants.

Bump your dependencies

If your project is using an old version of a package and a dependency is using a newer version of that package, consider upgrading your project to use the newer version.

File issues!

If your project has a dependency and it's using an outdated version of a package, file an issue and notify the author to update the dependencies. Let's help keep our projects green and our applications secure, performant and bug-free!

Webpack versions

Webpack 3.x

npm install duplicate-package-checker-webpack-plugin@^2.1.0 --save-dev

Webpack 4.x

npm install duplicate-package-checker-webpack-plugin

Empty State

No vulnerabilities found.

10

Binary-Artifacts

Determines if the project has generated executable (binary) artifacts in the source repository.

10

License

Determines if the project has defined a license.

1

Code-Review

Determines if the project requires human code review before pull requests (aka merge requests) are merged.

0

Maintained

Determines if the project is "actively maintained".

0

CII-Best-Practices

Determines if the project has an OpenSSF (formerly CII) Best Practices Badge.

0

Security-Policy

Determines if the project has published a security policy.

0

Fuzzing

Determines if the project uses fuzzing.

0

Branch-Protection

Determines if the default and release branches are protected with GitHub's branch protection settings.

0

SAST

Determines if the project uses static code analysis.

0

Vulnerabilities

Determines if the project has open, known unfixed vulnerabilities.

Reason

91 existing vulnerabilities detected

Details

Warn: Project is vulnerable to: GHSA-v88g-cgmw-v5xw
Warn: Project is vulnerable to: GHSA-93q8-gq69-wqmw
Warn: Project is vulnerable to: GHSA-fwr7-v2mv-hh25
Warn: Project is vulnerable to: GHSA-8w4h-3cm3-2pm2
Warn: Project is vulnerable to: GHSA-67hx-6x53-jw92
Warn: Project is vulnerable to: GHSA-v6h2-p8h4-qcjw
Warn: Project is vulnerable to: GHSA-cwfw-4gq5-mrqx
Warn: Project is vulnerable to: GHSA-g95f-p29q-9xw4
Warn: Project is vulnerable to: GHSA-grv7-fg5c-xmjg
Warn: Project is vulnerable to: GHSA-x9w5-v3q2-3rhw
Warn: Project is vulnerable to: GHSA-c6rq-rjc2-86v2
Warn: Project is vulnerable to: GHSA-3xgq-45jj-v275
Warn: Project is vulnerable to: GHSA-rq8g-5pc5-wrhr
Warn: Project is vulnerable to: GHSA-w573-4hg7-7wgq
Warn: Project is vulnerable to: GHSA-hr2v-3952-633q
Warn: Project is vulnerable to: GHSA-h6ch-v84p-w6p9
Warn: Project is vulnerable to: GHSA-vh7m-p724-62c2
Warn: Project is vulnerable to: GHSA-r9p9-mrjm-926w
Warn: Project is vulnerable to: GHSA-434g-2637-qmqr
Warn: Project is vulnerable to: GHSA-49q7-c7j4-3p7m
Warn: Project is vulnerable to: GHSA-977x-g7h5-7qgw
Warn: Project is vulnerable to: GHSA-f7q4-pwc6-w24p
Warn: Project is vulnerable to: GHSA-fc9h-whq2-v747
Warn: Project is vulnerable to: GHSA-vjh7-7g9h-fjfh
Warn: Project is vulnerable to: GHSA-qrmc-fj45-qfc2
Warn: Project is vulnerable to: GHSA-8r6j-v8pm-fqw3
Warn: Project is vulnerable to: MAL-2023-462
Warn: Project is vulnerable to: GHSA-xf7w-r453-m56c
Warn: Project is vulnerable to: GHSA-q42p-pg8m-cqh6
Warn: Project is vulnerable to: GHSA-w457-6q6x-cgp9
Warn: Project is vulnerable to: GHSA-62gr-4qp9-h98f
Warn: Project is vulnerable to: GHSA-f52g-6jhx-586p
Warn: Project is vulnerable to: GHSA-2cf5-4w76-r9qv
Warn: Project is vulnerable to: GHSA-3cqr-58rm-57f8
Warn: Project is vulnerable to: GHSA-g9r4-xpmj-mj65
Warn: Project is vulnerable to: GHSA-q2c6-c6pm-g3gh
Warn: Project is vulnerable to: GHSA-765h-qjxv-5f44
Warn: Project is vulnerable to: GHSA-f2jv-r9rf-7988
Warn: Project is vulnerable to: GHSA-44pw-h2cw-w3vq
Warn: Project is vulnerable to: GHSA-jp4x-w63m-7wgm
Warn: Project is vulnerable to: GHSA-c429-5p7v-vgjp
Warn: Project is vulnerable to: GHSA-43f8-2h32-f4cj
Warn: Project is vulnerable to: GHSA-qqgx-2p2h-9c37
Warn: Project is vulnerable to: GHSA-2pr6-76vf-7546
Warn: Project is vulnerable to: GHSA-8j8c-7jfh-h6hx
Warn: Project is vulnerable to: GHSA-896r-f27r-55mw
Warn: Project is vulnerable to: GHSA-9c47-m6qq-7p4h
Warn: Project is vulnerable to: GHSA-6c8f-qphg-qjgp
Warn: Project is vulnerable to: GHSA-76p3-8jx3-jpfq
Warn: Project is vulnerable to: GHSA-3rfm-jhwj-7488
Warn: Project is vulnerable to: GHSA-hhq3-ff78-jv3g
Warn: Project is vulnerable to: GHSA-fvqr-27wr-82fm
Warn: Project is vulnerable to: GHSA-4xc9-xhrj-v574
Warn: Project is vulnerable to: GHSA-x5rq-j2xg-h7qm
Warn: Project is vulnerable to: GHSA-jf85-cpcp-j695
Warn: Project is vulnerable to: GHSA-p6mc-m468-83gw
Warn: Project is vulnerable to: GHSA-29mw-wpgm-hmr9
Warn: Project is vulnerable to: GHSA-35jh-r3h4-6jhm
Warn: Project is vulnerable to: GHSA-4xcv-9jjx-gfj3
Warn: Project is vulnerable to: GHSA-f9cm-qmx5-m98h
Warn: Project is vulnerable to: GHSA-7wpw-2hjm-89gp
Warn: Project is vulnerable to: GHSA-952p-6rrq-rcjv
Warn: Project is vulnerable to: GHSA-f8q6-p94x-37v3
Warn: Project is vulnerable to: GHSA-vh95-rmgr-6w4m
Warn: Project is vulnerable to: GHSA-xvch-5gv4-984h
Warn: Project is vulnerable to: GHSA-fhjf-83wg-r2j9
Warn: Project is vulnerable to: GHSA-5fw9-fq32-wv5p
Warn: Project is vulnerable to: GHSA-6394-6h9h-cfjg
Warn: Project is vulnerable to: GHSA-hj48-42vr-x3v9
Warn: Project is vulnerable to: GHSA-h7cp-r72f-jxh6
Warn: Project is vulnerable to: GHSA-v62p-rq8g-8h59
Warn: Project is vulnerable to: GHSA-hrpp-h998-j3pp
Warn: Project is vulnerable to: GHSA-6g33-f262-xjp4
Warn: Project is vulnerable to: GHSA-p8p7-x288-28g6
Warn: Project is vulnerable to: GHSA-c2qf-rxjj-qqgw
Warn: Project is vulnerable to: GHSA-h9rv-jmmf-4pgx
Warn: Project is vulnerable to: GHSA-hxcc-f52p-wc94
Warn: Project is vulnerable to: GHSA-jv35-xqg7-f92r
Warn: Project is vulnerable to: GHSA-4g88-fppr-53pp
Warn: Project is vulnerable to: GHSA-4jqc-8m5r-9rpr
Warn: Project is vulnerable to: GHSA-2m39-62fm-q8r3
Warn: Project is vulnerable to: GHSA-vx3p-948g-6vhq
Warn: Project is vulnerable to: GHSA-mf6x-7mm4-x2g7
Warn: Project is vulnerable to: GHSA-j44m-qm6p-hp7m
Warn: Project is vulnerable to: GHSA-3jfq-g458-7qm9
Warn: Project is vulnerable to: GHSA-5955-9wpr-37jh
Warn: Project is vulnerable to: GHSA-f5x3-32g6-xq36
Warn: Project is vulnerable to: GHSA-jgrx-mgxx-jf9v
Warn: Project is vulnerable to: GHSA-72xf-g2v4-qvf3
Warn: Project is vulnerable to: GHSA-c4w7-xm78-47vh
Warn: Project is vulnerable to: GHSA-p9pc-299p-vxgp

Score

1.9

/10

Last Scanned on 2025-07-07

The Open Source Security Foundation is a cross-industry collaboration to improve the security of open source software (OSS). The Scorecard provides security health metrics for open source projects.